December 2007 Little Campbell Creek Watershed Management Plan Table of Contents Executive Summary ...................................................................................................................................................................................................... i Acknowledgements ......................................................................................................................................................................................................ii 1 Introduction.............................................................................................................................................................................................................. 3 Regulations and Plans....................................................................................................................................................................................... 3 Importance of Watershed Planning................................................................................................................................................................... 4 2 Creation of the Plan................................................................................................................................................................................................. 5 Agency Involvement......................................................................................................................................................................................... 5 Community Involvement .................................................................................................................................................................................. 6 Vision, Mission and Goals................................................................................................................................................................................ 8 3 Watershed Characterization................................................................................................................................................................................... 9 Location and Watershed Features..................................................................................................................................................................... 9 Climate and Soils............................................................................................................................................................................................ 12 Land Use and Population................................................................................................................................................................................ 13 Impervious Surfaces and Stormwater ............................................................................................................................................................. 18 Hydrology and Water Quantity....................................................................................................................................................................... 24 Channel Modifications.................................................................................................................................................................................... 26 Biology and Vegetation .................................................................................................................................................................................. 28 Channel Habitat .............................................................................................................................................................................................. 31 Water Quality.................................................................................................................................................................................................. 31 3 Watershed Issues.................................................................................................................................................................................................... 35 Water Quality.................................................................................................................................................................................................. 35 Water Quantity................................................................................................................................................................................................ 39 Terrestrial and Aquatic Habitat....................................................................................................................................................................... 41 Recreational and Economic Opportunities and Open Space........................................................................................................................... 42 Communication, Coordination, and Data Acquisition.................................................................................................................................... 43 5 Plan Implementation ............................................................................................................................................................................................. 44 Water Quality.................................................................................................................................................................................................. 46 Water Quantity................................................................................................................................................................................................ 48 Terrestrial Habitat ........................................................................................................................................................................................... 49 Aquatic Habitat ............................................................................................................................................................................................... 50 Recreational and Economic Opportunities ..................................................................................................................................................... 51 Communication and Coordination.................................................................................................................................................................. 52 Open Space ..................................................................................................................................................................................................... 54 Data Acquisition ............................................................................................................................................................................................. 55 Table of Contents Little Campbell Creek Watershed Management Plan List of Figures Figure 3.1. Watershed Delineation .............................................................................................................................................................................. 10 Figure 3.2. Drainage Area and Stream Length within the Little Campbell Creek Watershed..................................................................................... 11 Figure 3.3. Historic Comparison.................................................................................................................................................................................. 15 Figure 3.4. Landuse – 2004.......................................................................................................................................................................................... 16 Figure 3.5. Landuse in Riparian Areas - 2004 ............................................................................................................................................................. 17 Figure 3.6. Impervious Surfaces .................................................................................................................................................................................. 19 Figure 3.7. Stormwater Infrastructure.......................................................................................................................................................................... 21 Figure 3.8. Sedimentation Ponds and Contributing Drainage Areas ........................................................................................................................... 22 Figure 3.9. Mapped Flood Limits ................................................................................................................................................................................ 23 Figure 3.10. Estimated Annual Hydrograph for Little Campbell Creek, Station 1NF-AL east of Abbott Loop......................................................... 25 Figure 3.11. Average daily stream flow at USGS gage 15274550, Little Campbell Creek at Nathan Drive (10/1/89-9/30/90)................................. 26 Figure 3.12. Channel Attributes................................................................................................................................................................................... 27 Figure 3.13. Biotic Assessment ..................................................................................................................................................................................